[fix] expose init and render for adapters

Author: benmccann

.changeset/five-bags-prove.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/kit': patch
+---
+
+[fix] expose init and render for adapters

packages/kit/types/app.d.ts

@@ -1,16 +1,17 @@
 import { ReadOnlyFormData, RequestHeaders } from './helper';
 import { ServerResponse } from './hooks';
 
+export interface Init {
+	(): void;
+}
+
+export interface Render {
+	(incoming: IncomingRequest): Promise<ServerResponse>;
+}
+
 export interface App {
-	init(options?: {
-		paths: {
-			base: string;
-			assets: string;
-		};
-		prerendering: boolean;
-		read(file: string): Buffer;
-	}): void;
-	render(incoming: IncomingRequest): Promise<ServerResponse>;
+	init: Init;
+	render: Render;
 }
 
 export type RawBody = null | Uint8Array;

packages/kit/types/index.d.ts

@@ -3,7 +3,7 @@
 
 import './ambient-modules';
 
-export { App, IncomingRequest, RawBody } from './app';
+export { App, IncomingRequest, Init, RawBody, Render } from './app';
 export { Adapter, AdapterUtils, Config, PrerenderErrorHandler, ValidatedConfig } from './config';
 export { EndpointOutput, RequestHandler } from './endpoint';
 export { ErrorLoad, ErrorLoadInput, Load, LoadInput, LoadOutput, Page } from './page';

packages/kit/types/internal.d.ts

@@ -19,6 +19,15 @@ export interface PrerenderOptions {
 }
 
 export interface App extends PublicApp {
+	 init(options?: {
+		paths: {
+			base: string;
+			assets: string;
+		};
+		prerendering: boolean;
+		read(file: string): Buffer;
+	}): void;
+
 	render(
 		incoming: IncomingRequest,
 		options?: {